#include <u.h>
#include <libc.h>

void	_xinc(uint*);
void	_xdec(uint*);

enum {
	N	= 1<<30,
};

void
loop(void)
{
	uint i;

	for(i = 0; i < N; i++)
		;
}

void
loopxinc(void)
{
	uint i, x;

	for(i = 0; i < N; i++){
		_xinc(&x);
		_xdec(&x);
	}
}

void
looplock(void)
{
	uint i;
	static Lock l;

	for(i = 0; i < N; i++){
		lock(&l);
		unlock(&l);
	}
}

void
timing(char *s, void (*f)(void))
{
	uvlong t[2];

	t[0] = nsec();
	f();
	t[1] = nsec();
	fprint(2, "%s\t%llud nsec/call\n", s, (t[1] - t[0])/(uvlong)N);
}

void
main(void)
{
	nsec();
	timing("loop", loop);
	timing("loopxinc", loopxinc);
	timing("looplock", looplock);
	exits("");
}